[Bug 1749923] Re: ubuntu 18.04 installer crashed at the end of installation alongside a ubuntu 16.04.3 installation

[Gil0224]

Hi to everybody

I tried many times today with the new 18.04 LTS, without success
(SHA256SUM controlled).

I've followed too recommendations described here :
https://help.ubuntu.com/community/UEFI#General_principles

I wanted to replace the last 17.10 OS with the new 18.04 LTS version and
conserving the /home partition with the same user-name, as I done many
times before, but the installation crashes always at the end : "grub-
efi-amd64-signed failed installation /target/"...

The partition is a gpt one, SecureBoot disabeled in the BIOS, as
usual... and the 17.10 version was working fine.

My mther board is a J4205-ITX asrock...

Any suggestion would be very welcome!

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https://bugs.launchpad.net/bugs/1749923

Title:
  ubuntu 18.04 installer crashed at the end of installation alongside a
  ubuntu 16.04.3 installation

Status in grub-installer package in Ubuntu:
  Confirmed

Bug description:
  couldn't install grub on either of the two available disks at the end
  of the installation.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.1
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CasperVersion: 1.388
  Date: Fri Feb 16 12:25:04 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180216)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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